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EMRS Spring Meeting - 2013
Helmut Riedl (H. Riedl)
"An approach for coating development in the field of hot stamping: A combined experimental and calculational study."
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New manufacturing processes are required to meet the continuously increasing demands on structural components (e.g. B-pillar) in the automotive industry. Hot stamping is a high temperature metal forming process using ultra high strength steels (UHSS) which can be formed and hardened within one forming stroke. However, this high temperature environment results in scale formation and corrosion of the UHSS sheets. Therefore AlSi coatings are used, protecting the steel against chemical fatigue. Unfortunately, at high temperatures AlSi exhibits a strong tendency to interact with the surface of the forming tool, resulting in an Al-rich AlSi-build up. The goal is to protect the forming tools with a coating that exhibits high oxidation and wear resistance as well as low affinity to adhesive AlSi wear products. Experimental tests were performed on TiN, TiAlN and CrSiN coatings. The forming process was simulated using SRV-testing equipment applying different numbers of strokes. These SRV-experiments show that the amount of Al sticking to the coating is lowest for CrSiN. To verify the experimental findings, Density Functional Theory was employed to calculate the adsorption energies of Al on different systems such as Ti, TiN, TiAlN, AlN, CrN and CrSiN. Our obtained results propose that Si lowers the Al adsorption energy, which is in agreement with the experimental observations.

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2011 - 2018 - Christian Doppler Laboratory for Application Oriented Coating Development